quote; what are the spec for a mup sink with 3'' drain peatrap ect ????

1. The mop sink MUST have a 3" drain outlet.

That is the only REQUIREMENT. All the rest is personal preference or specific to your needs. Floor mount or pedestal? 24x20, 24x24, 24x36? Terrazzo, cast iron, china, FlorStone? It is all up to you and what you need it for.